非饱和土壤中树木诱导毛细管电位模拟的时间步长

M. Abdullahi
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引用次数: 0

摘要

土壤性质假设、经过时间选择、时间步长选择和大气变量的不可靠性导致模拟结果的大部分不一致。因此,研究的时间步长是基于博尔德粘土上一棵石灰树的根系吸水量。研究了在30、90、190和270天的时间内,¼、½和1天的时间步长对距离石灰树0.0米、1.4米和3.0米处产生的毛细管电位的影响。使用了一个直接的根系吸水汇项,并将其与非饱和土壤的二维轴对称控制方程相结合。模拟的毛细管电位与经过的时间成正比。研究发现,所研究的时间步长在相同的空间距离下产生相同的毛细管电位。其想法是研究在距离Boulder Clay上的石灰树相同空间距离的¼、½和1天时间步长下产生的毛细管电位。因此,三个初始时间步长产生的结果差异远小于±5%,这是令人满意的。关键词:非饱和土,边界条件,毛细管电位,空间离散化,时间离散化。
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Time step-size on simulation of tree-induced capillary potential in unsaturated soils
Unreliability in the assumption of soil properties, selection of elapse time, choice of time step size and atmospheric variables causes most inconsistencies in the simulation results. Therefore, time step size studied was based on root water up-take on a single Lime tree on a Boulder Clay. The effects of ¼, ½ and 1 day time step sizes on generated capillary potential at 0.0 m, 1.4 m and 3.0 m from the lime tree for  elapse time of 30, 90, 190 and 270 days elapsed time were studied. A straightforward sink term for root water uptake was used and combined with two-dimensional axi-symmetric governing equation for unsaturated soil. The simulated capillary potential was directly proportional to the elapsed time. The time step sizes studied were found to give the same generated capillary potentials at same spacial distances. The idea was to investigate the generated capillary potentials at ¼, ½ and 1 days time steps sizes at a same spatial distance from the Lime tree on a Boulder Clay should be the same. Consequently, the difference in the results generated with the three initial time step sizes were far less than ±5%, which is satisfactory.   Key words: Unsaturated soil, boundary condition, capillary potential, spatial discretization, time discretization.
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来源期刊
Scientific Research and Essays
Scientific Research and Essays 综合性期刊-综合性期刊
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发文量
6
审稿时长
3.3 months
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